Hypoellipticity of second order operators in \(\mathbb{R}^ 2\) of the form \(fX^ 2+Y+g\)

zbMath0876.35025MaRDI QIDQ1356385

Toyohiro Akamatsu

Publication date: 25 November 1997

Published in: Osaka Journal of Mathematics (Search for Journal in Brave)

zbMATH Keywords

hypoellipticity

Mathematics Subject Classification ID

Hypoelliptic equations (35H10)

Related Items (1)

Hypoellipticity of a second order operator with a principal symbol changing sign across a smooth hypersurface

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